PT-2026-61288 · Linux · Linux

CVE-2026-63971 · Published 2026-07-19 · Updated 2026-07-19

NVD

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

In the Linux kernel, the following vulnerability has been resolved:

sctp: fix race between sctp wait for connect and peeloff

sctp wait for connect() drops and re-acquires the socket lock while waiting for the association to reach ESTABLISHED state. During this window, another thread can peeloff the association to a new socket via getsockopt(SCTP SOCKOPT PEELOFF), changing asoc->base.sk. After re-acquiring the old socket lock, sctp wait for connect() returns success without noticing the migration — the caller then accesses the association under the wrong lock in sctp datamsg from user().

Add the same sk != asoc->base.sk check that sctp wait for sndbuf() already has, returning an error if the association was migrated while we slept.

Fix

Related Identifiers

CVE-2026-63971

Affected Products

Linux

References · 9

• https://nvd.nist.gov/vuln/detail/CVE-2026-63971 · Security Note
• https://git.kernel.org/stable/c/8e9b56051d24540cfbf39194618708c4a7633549 · Note
• https://git.kernel.org/stable/c/f14fe6395a8b3d961a61e138ad7b36ba3626dd4e · Note
• https://git.kernel.org/stable/c/bcfeac79af740735ace44008b4a11b8e5add20f5 · Note
• https://git.kernel.org/stable/c/7d2038d4b80166f7bead8d07eba3b97405816c21 · Note
• https://git.kernel.org/stable/c/68667ee4c7dadf7f63167234e2a1af09b3f7874e · Note
• https://git.kernel.org/stable/c/6140cfa721451fa6e18e134e709703c2bf34d0fb · Note
• https://git.kernel.org/stable/c/0e0d5bc76fd4267a71334fcc8f1a5fbcf997845d · Note
• https://git.kernel.org/stable/c/634a9af8a26a84d8b0d7b3b643204b344b42d9fb · Note